What third party app is this you are talking about? First time i hear it 
dreds.jeckyl.net
Its a web app, so you need either an android phone (with Chrome loaded) or an iphone and an app called WebBLE, or run it on a computer with Bluetooth on.
Things it does that the factory app doesn't: 1) allows you to save fine tuning configurations 2) allows you to enable race mode while leaving sleep mode on 3) allows fd fine tuning 4) allows you to kill the fd protect feature that blocks the small three cogs in little ring 5) allows you to see adjustments without having to shift to another gear and back 6) so long as you find the groupset with a web connection -or cell- you can leave it loaded and adjust things on the road without connectivity
Theres a bunch of information on this on the Facebook Wheeltop users group.